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From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Chengfeng Ye <cyeaa@connect.ust.hk>, Takashi Iwai <tiwai@suse.de>,
	Sasha Levin <sashal@kernel.org>,
	perex@perex.cz, tiwai@suse.com, alsa-devel@alsa-project.org
Subject: [PATCH AUTOSEL 4.19 20/21] ALSA: gus: fix null pointer dereference on pointer block
Date: Tue,  9 Nov 2021 17:23:09 -0500	[thread overview]
Message-ID: <20211109222311.1235686-20-sashal@kernel.org> (raw)
In-Reply-To: <20211109222311.1235686-1-sashal@kernel.org>

From: Chengfeng Ye <cyeaa@connect.ust.hk>

[ Upstream commit a0d21bb3279476c777434c40d969ea88ca64f9aa ]

The pointer block return from snd_gf1_dma_next_block could be
null, so there is a potential null pointer dereference issue.
Fix this by adding a null check before dereference.

Signed-off-by: Chengfeng Ye <cyeaa@connect.ust.hk>
Link: https://lore.kernel.org/r/20211024104611.9919-1-cyeaa@connect.ust.hk
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 sound/isa/gus/gus_dma.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/sound/isa/gus/gus_dma.c b/sound/isa/gus/gus_dma.c
index 7f95f452f1064..48e76b8fede41 100644
--- a/sound/isa/gus/gus_dma.c
+++ b/sound/isa/gus/gus_dma.c
@@ -141,6 +141,8 @@ static void snd_gf1_dma_interrupt(struct snd_gus_card * gus)
 	}
 	block = snd_gf1_dma_next_block(gus);
 	spin_unlock(&gus->dma_lock);
+	if (!block)
+		return;
 	snd_gf1_dma_program(gus, block->addr, block->buf_addr, block->count, (unsigned short) block->cmd);
 	kfree(block);
 #if 0
-- 
2.33.0


  parent reply	other threads:[~2021-11-09 22:40 UTC|newest]

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-11-09 22:22 [PATCH AUTOSEL 4.19 01/21] arm64: zynqmp: Do not duplicate flash partition label property Sasha Levin
2021-11-09 22:22 ` [PATCH AUTOSEL 4.19 02/21] arm64: zynqmp: Fix serial compatible string Sasha Levin
2021-11-09 22:22 ` [PATCH AUTOSEL 4.19 03/21] scsi: lpfc: Fix list_add() corruption in lpfc_drain_txq() Sasha Levin
2021-11-09 22:22 ` [PATCH AUTOSEL 4.19 04/21] arm64: dts: hisilicon: fix arm,sp805 compatible string Sasha Levin
2021-11-09 22:22 ` [PATCH AUTOSEL 4.19 05/21] arm64: dts: rockchip: add Coresight debug range for RK3399 Sasha Levin
2021-11-09 22:22 ` [PATCH AUTOSEL 4.19 06/21] usb: musb: tusb6010: check return value after calling platform_get_resource() Sasha Levin
2021-11-09 22:22 ` [PATCH AUTOSEL 4.19 07/21] usb: typec: tipd: Remove WARN_ON in tps6598x_block_read Sasha Levin
2021-11-09 22:22 ` [PATCH AUTOSEL 4.19 08/21] arm64: dts: freescale: fix arm,sp805 compatible string Sasha Levin
2021-11-09 22:22 ` [PATCH AUTOSEL 4.19 09/21] ASoC: nau8824: Add DMI quirk mechanism for active-high jack-detect Sasha Levin
2021-11-09 22:22 ` [PATCH AUTOSEL 4.19 10/21] scsi: advansys: Fix kernel pointer leak Sasha Levin
2021-11-09 22:23 ` [PATCH AUTOSEL 4.19 11/21] firmware_loader: fix pre-allocated buf built-in firmware use Sasha Levin
2021-11-09 22:23 ` [PATCH AUTOSEL 4.19 12/21] ARM: dts: omap: fix gpmc,mux-add-data type Sasha Levin
2021-11-09 22:23 ` [PATCH AUTOSEL 4.19 13/21] usb: host: ohci-tmio: check return value after calling platform_get_resource() Sasha Levin
2021-11-09 22:23 ` [PATCH AUTOSEL 4.19 14/21] ALSA: ISA: not for M68K Sasha Levin
2021-11-09 22:23 ` [PATCH AUTOSEL 4.19 15/21] tty: tty_buffer: Fix the softlockup issue in flush_to_ldisc Sasha Levin
2021-11-09 22:23 ` [PATCH AUTOSEL 4.19 16/21] MIPS: sni: Fix the build Sasha Levin
2021-11-09 22:23 ` [PATCH AUTOSEL 4.19 17/21] scsi: target: Fix ordered tag handling Sasha Levin
2021-11-09 22:23 ` [PATCH AUTOSEL 4.19 18/21] scsi: target: Fix alua_tg_pt_gps_count tracking Sasha Levin
2021-11-09 22:23 ` [PATCH AUTOSEL 4.19 19/21] powerpc/5200: dts: fix memory node unit name Sasha Levin
2021-11-09 22:23 ` Sasha Levin [this message]
2021-11-09 22:23 ` [PATCH AUTOSEL 4.19 21/21] powerpc/dcr: Use cmplwi instead of 3-argument cmpli Sasha Levin

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